best anal plug for beginners and PIV

Hi,
I am looking for first anal plug for my wife. It has to be safe (!) and we are looking for best plug during sex PIV.

I am thinking about T Shape but I am worry that it will be problem during doggy or missionary position – is it possible to enter vagina with inserted t shape plug in ass?
Won’t I hurt my wife ass? Should I be carful to not to hit plug?

Thanks

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