Not a Bones owner, but I’ve sold some….
You’ll almost always get a bike to sit on it, though the “angle of dangle” may mean that the front wheel is perilously close to the road. On some vehicle this could mean the wheel hitting the ground on bumps. You’re right to point out that small full-sus frames are the worst offenders. In this case, I think you may find there’s not a long enough run of uninterrupted top tube for both of the Bones straps to fit.
You can buy an adapter that fits between seatpost and bars to create a virtual top tube. That will make the bike more level and avoids having any weight resting on the shock.
My advice would be to take the car and bike to a shop where you can try it all out.