I’ve had good success with the Leapers/UTG brand one piece mounts made for airgun and rimfire rails. There are models for 1” and 30 mm scope tubes and several heights.
I have three Winchester 4x32 AO scopes. These come with rings for an air rifle and would clamp right onto the 11mm/ 3/8"/dovetails on your 901. The scope has a short warranty period, but should hold up easily to your 901. You would not have to go for an within scope with a multi-pumper , but having AO is nice.