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if you don't have 6 weeks before your first frost, delay planting until early spring. Prepare the ground this fall so it can settle over winter. I usually dig in several inches of both compost and sphagnum peat moss. Wait on fertilizer until new leafy growth appears on your roses. Adding bone meal and Epsom salts are questionable practices and should be avoided without a soil test first. I've linked to articles on bare root roses, when to plant roses and how to plant roses.
https://www.gardeningknowhow.com/.../roses/bare-root-roses.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/planting-rose-bushes-in-the-fall.htm
https://www.gardeningknowhow.com/.../roses/planting-rose-bushes.htm

It looks like you are in agricultural or hardiness zone 4b/5a. This puts you on the edge of KnockOut roses hardiness zone. There are 2 things you should do to over-winter them: 1. Make sure the soil is moist right up until the ground freezes; 2. mulch the rose crown and rootball with 3-4 inches of mulch. Straw, pine boughs, chopped leaves and shredded or chipped wood are all fine. Snow acts as an excellent insulator. If winters are severe, you will have some winter-kill of rose canes. In early spring as the leaf buds are swelling or breaking open, prune back as far as needed to reach pith (inside of cane) that is white. I have had years where I needed to prune everything down to 12-18 inches. Even so, the roses roared back and were the same height as previous years by mid-summer. Here is more info: https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/care-knockout-roses.htm

KnockOut roses are grafted which means they are attached to a different rose's roots. This helps them grow quickly and improves hardiness. Sometimes, the roots send up shoots that are clearly different from your KnockOut. If you follow these shoots down to where they originate, you will see that they don't come from the base of the rose like the other canes. These come from below the soil line and should be broken off. Cut the cane to 12 inches, brush away the soil gently and snap the cane off where it starts. Simply cutting it ensures it will keep coming back. These rootstock canes divert a lot of energy away from the rest of the bush and if left unchecked, can overwhelm the grafted rose. Here is an article with more information: https://www.gardeningknowhow.com/ornamental/flowers/roses/removing-rose-suckers.htm

This article will help you with pruning.
https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/prune-knockout-roses.htm

Prune in early spring.
This article will help you.
https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/prune-knockout-roses.htm

Rose trees are made by grafting the flowering part onto a long stem of a different rose. Any growth from below the graft will not look like the top growth and will pull energy away from the top growth. So, no, you can not get your rose to send out new shoots on the bare stem.
https://www.gardeningknowhow.com/ornamental/flowers/roses/learn-more-about-tree-roses.htm