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Unfortunately, the tag misrepresented the potential of that shrub. Ultimately, they can reach a spread of about 10 feet, more or less.

The best thing may be to train it in the shape that you want. training wire is perfect for this. Make sure that it is rubber coated, as most horticultural bonsai wire should be.If you choose an uncoated wire, make sure that it is made of anodized aluminum to avoid damage to the tree. Depending on the material of the coat hanger, it can have negative reactions with the tree's bark.

If it does get too unruly, you can always prune.

Here is an article to help you with the care of Junipers:

https://www.gardeningknowhow.com/ornamental/shrubs/juniper/care-of-junipers.htm

Yellowing leaves may indicate a watering issue; too much or too little.
Adjust watering schedule and monitor the juniper for a return to normal color.
Water the juniper shrub in thoroughly at the time of planting and twice weekly for a month following planting. Decrease the frequency of watering so that you only irrigate the juniper once every week or two during periods of extended drought. Junipers are more likely to suffer from overwatering or diseases encouraged by excessive moisture than drought stress.

https://www.gardeningknowhow.com/ornamental/shrubs/juniper/skyrocket-juniper-plants.htm

The photo is only captioned as a juniper tree, no variety name. Many species have a very similar growth but can't be identified by looks alone. Juniperus occidentalis is a common species that remains tall; here is more:

https://oregonstate.edu/trees/conifer_genera/spp/juniper_spp.html

http://www.hort.uconn.edu/plants/detail.php?pid=226

If there are too many to pull off the bags, you may need to contact your local extension agent for advice. Spraying for them in May when the worms are small is the best treatment. They are hard to eradicate at any other time, except by picking off bags.

https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm

Since both of them are hardy to at least two zones lower than yours, they should do fine. The answer also depends upon what size container they're in now. You'll only want to repot them to the next larger sized pot or, if they're not in pots, you should be able to dig the hole twice as wide and deep as the root ball. The height or width of the pot should be about 2/3 the height of the plant for stability. These plants may become pot-bound and need their roots trimmed in order to keep them the size you want. You may want to mulch around the base of the plants if you're expecting a cold winter.
Here's a good article that should be helpful: https://extension.psu.edu/programs/master-gardener/counties/lackawanna/news/2015/container-grown-trees-and-shrubs-2013-fix-those-roots-before-you-plant

https://www.gardeningknowhow.com/special/containers/evergreens-for-containers.htm

https://www.gardeningknowhow.com/ornamental/shrubs/juniper/wichita-blue-juniper-care-tips-growing-wichita-blue-junipers.htm

All junipers have some level of toxicity, usually low. The first article, however, sites Chinese juniper berries as edible, often used for seasoning.

https://plants.ces.ncsu.edu/plants/juniperus-chinensis/

https://ucanr.edu/sites/poisonous_safe_plants/Toxic_Plants_by_common_Name_659/

https://www.chop.edu/centers-programs/poison-control-center/poisonous-berries

https://secure.caes.uga.edu/extension/publications/files/pdf/C%20957_3.PDF

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=279597

https://www.gardeningknowhow.com/ornamental/shrubs/juniper/are-all-juniper-berries-edible.htm