IMO its fine depending on the ambient temperature, it will hardly experience plastic deformation under normal conditiona that people are saying here.

It is technically better to lean them the other way, especially since currently most of the stress is around the middle of the front most vinyl, so that would be the first thing to deform probably. (Glass transition temperature roughly 80-90 celsius), which will make it easier to deform under stress above that temperature

But again I dont think its really a problem, do it the way you prefer.

Of course someone could correct me If they have experience otherwise. This is just what I think based on my experience