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The blooms being gone could be the end of the bloom cycle unless the petals look like they have been eaten on. If they have, plus damage to the foliage could be Bud Worm. Or some other worms attacking the foliage at night, disappearing by daylight usually hiding under the foliage/leaves. Here is a link to an article about the bud worms : https://www.gardeningknowhow.com/ornamental/flowers/roses/budworms-roses.htm
The same things noted in the article to control them will control similar pests as well.

There could be something going on with the dirt in that mound that has had a negative effect upon the rosebushes. Do you know where the dirt came from? If it was from a foundation dig, there could be some pH problems with it. It would be good to take some in to a soils lab near you and have it tested just to be sure. It could also be too much rain and wind on the rosebushes. They could be showing signs of being in shock as well as stressed out. Transplant shock, then an over abundance of water stress added to it all wind whipping stress. If you know the dirt is okay, just wait a few days. Let things dry out a bit, then when you do water them add some root stimulator and a product called Super Thrive to the same water. This mix will go a long way to helping the rosebushes recover from the multi shock and stress battle they have been going through.

You can certainly shape prune or trim up your roses. The Knockout roses are low maintenance roses so you do not have to dead head them (remove old spent blooms) unless you want to, as the old blooms will fall off and new buds and blooms come back on for another bloom cycle. Sometimes the rosebushes get a bit wild looking and not nice shaped bushes, you can certainly do the shaping pruning any time but if it is at a time when the bushes are setting new buds for another bloom cycle, many blooms will be lost until a new batch of buds is produced. Here are some links to articles for you to check out:

https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/care-knockout-roses.htm

https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/prune-knockout-roses.htm

Leaving the rose petals on the ground will not be of harm. Some folks rake them up lightly just to keep things looking tidy, but leaving some to turn back into the earth can actually help build the soils. I usually lightly rake them up for the appearance and so that there are no large clumps that would take a long while to decay away into the soils.

It sounds like the rosebushes are under some sort of stress. Lack of water and food/fertilizer can be such problems as can heat stress. Other forms of stresses would include insect attacks or attacks by funguses. Here is a link to an article that may be useful to help with your problem: https://www.gardeningknowhow.com/ornamental/flowers/roses/no-blooms-on-roses.htm

It sounds like you have insect and fungus problems with your rosebushes. The new growth shows that they are fighting whatever it is to try and survive. I would suggest spraying all of the rosebushes with an insecticide and then spray them with a good fungicide about 5 days later. Make sure to water the rosebushes well prior to both applications. Please check out these articles links:

https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-bush-diseases.htm

Be sure the rosebushes are well watered and well fed. Also keep an eye on them as I have seen something similar to what you describe happen to the canes when a dog as relieved himself upon the roses.