I went with the Romeo zero. And the mount that is made and sold by Mr Tanner on this forum.
His mount comes with 2 sets of screws and I was not sure which set to use. I figured it out. Looked like the larger Dia head ones. I have it all mounted up but have not had a chance to shoot it yet. Have had both knees replaced a few years ago and one did not turn out well. Cold weather has me down so hope to get out and try the redot in next couple weeks. Take care of your knees , these knee replacements don’t always turn out for the better. MD