I've seen several types of plastic and rubber shoes, the more flexible ones being responsible for some really nasty broken out walls. In Europe trotter people use them, alone, or together with a thin aluminum shoe, again, nasty broken out walls. They are thinner, tho.
I can see a " flexible" shoe attached with glue, not with nails. Flexible hoof and flexible shoe held together with rigid nails....I see trouble.
I've looked at the founder shoe( of course lol), pretty close to what my farriers made for my mare, without the front bar and in metal.
I will not comment on the two foundered and shod hooves shown ......