Seen severla anty roots like that. Think you'll be ok. Don't look like a ton of roots for a bareroot tree. I'd plant that probably even a touch deeper to get those top roots in some soil. I'd probably prune the tree a bit too based on the rootball size.
Breakup the soil well you plan on putting back in the hole. PRess it down good with your fingers. I try to fan out the roots best you can too. My tree spots are about 4ft wide and 6ft long. ammend, rototill tin, then dig out loose soil and ammend n orotiller down deeper. Sometime do 2 deep sometimes 3. Done like that the roots would be freee to move out some.
I'd easily have 6-8 trees in my backyard that are doing good and looked like yours. I usually ask for smaller trees because the root to wood ratio is better.
I got b118,anty, siberian, m111, and m7 coming in this year. I'll take a pic of each to show the differences.
What rootstock is that?