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Creeping juniper is normally very popular for those kinds of areas.

This article has some suggestions that you may like:
https://www.gardeningknowhow.com/ornamental/shrubs/shgen/foundation-plants.htm

Almost any shrub will grow in a container, but to make things easier for yourself, look for small or slow growing varieties, especially ones with the word "dwarf" in the name. You may also want to look for shrubs that are hardy to one zone lower than your own, as plants in containers are exposed to more cold than those in the ground. This article will also help if you have not read it: https://www.gardeningknowhow.com/ornamental/shrubs/shgen/potted-shrubs-growing-shrubs-in-containers.htm

Most full sun plants will work in a location like this. You might like coral bells, sedums, lady's mantel, cranesbill or yarrow.

As a general rule tree roots will extend up to 2. 5 times the height of the tree, and some species of trees may have roots extending five to seven times the height of the tree. With that in mind you may want to keep any trees within 10-15 feet from any sewer lines. Of course, even those less prone to damaging these lines will seek out water if not given enough--just another thing to keep in mind. Possible choices here include some varieties of lilac, crepe mytle, and dogwood.

I plant impatiens. They come in all colors and the roots are shallow. I mix in bags of garden soil around the tree to nourish the plants.