Tuning the gun, mostly just replacing the main seal with a better one will reduce the abuse the gun puts on the scope. You can also sand the face of the seal to be thinner thus raising the compression ratio which also helps, and depending on the gun can help a lot. Plus it bumps power and reduces hold sensitivity. It also reduces the chance of the scope slipping on the rail. I wouldn't bother with a scope mount that has some angle built in, plus they're expensive.
I would consider shimming the scope to match the barrel droop. How much they droop varies with each gun. Shimming helps with accuracy and keeping the scope on target. None of this may make sense, but it's true and I can explain if needed.
My best scope is a nikon, and not airgun rated. Since I tune all my guns I have never broken a scope. I also don't have problems with them sliding.
My favorite scope mount is a cheapie one-piece mount that is sold under several names, but the ones I have are Center Point that I got from Crosman and are the medium height #CPM1PA-25M. Most guns come with high mounts, like the RWS, but the medium looks much better imo because the scope sits lower, plus it helps with accuracy. The medium doesn't fit all scopes, for example a 40mm is about the limit, and if you have a fatter AO it may not fit, or the caps may not fit. The last gun I put them on with a generic 3-9x40AO Centerpoint the gap between the AO ring and gun is just a couple thou, no room for the caps unless I trim them, which is worth it imo. The price has gone way up, I got mine for $6 and bought ~8 of them. They have a set screw that matches a hole in the Crosman rail, but even w/o that they still lock down good. If you don't have that hole and don't want to drill one you can drill/tap the mount for two extra screws making it a 5 screw clamp. Looks cool too. Back in the day when Beeman/RWS were the only ones with cool one-piece mounts I bought a 4 screw RWS clamp which is probably what you get with the RWS. It's very nice, just too tall for me. Considering the price I'd certainly buy the package deal. If you tune the gun the scope should last just fine. Unless you just wanted a scope with better optics, but then the more you spend the more you lose if the gun breaks it so I'd still tune it. food for thought.
Also, I wouldn't buy the "Compact" version of the gun, the shorter barrel costs power and increases cocking effort.
