I have a Swampfox Liberty & Justice RDS with the picatinny adapter, and it holds zero on my Beretta 1301 tactical. It's decent and it doesn't break the bank.
Sig Romeo can easily handle the massive rolling recoil of a .410 without blinking. Also, it can be fitted with a tall mount so that you can still use your irons underneath it. The two mounting options come included in the box.