Without adding much expense, Tesla could provide a hard point say on the sidewall of the trunk with a thumbscrew and plate. Then, it becomes a proposition for the owner to supply the spare wheel in the knowledge that it can be safely transported and will not be a missile hazard in the vehicle. While a wheel can fit in the frunk, it is my understanding that Tesla do NOT approve of that practice, probably because it has not been safety tested.
So supply your own wheel and cover and bolt to the side of the trunk to suit yourself.
So supply your own wheel and cover and bolt to the side of the trunk to suit yourself.