Fobus might be good. They have a model that rotates all around to whatever angle works best. I think they have a model designed for that. Can be mounted under a desk or whereever. I don't think they are a great carry holster but for this application they should work.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."