Could you post pictures or links to the holsters you're considering because I haven't seen any current holsters that cover higher than at the trigger guard and stock union. There are a few exceptions to this for some holsters with a thumb release or strap. I pay more attention to reliefs or cutouts for the mag release button on the holsters I buy or make. I won't mention why.
Thanks for the replies. I just bought this gun 2weeks ago. I never shot it. I called the dealer and explained the problem and asked if there was any way to exchange it. He told me to bring it back. We redid paperwork and I now have a m&p 9c with No safety.
There are less expensive copies out there now , but I use The Answer by Tucker Gunleather for my 40c with thumb safety. No issues whatsoever drawing or reholstering. Excellent quality and well made.