Here you go. It's a ZEV slide for the gen 5. Considering I paid double that for a Langdon RDO slide for my M9A1, I think that's a very fair price for what you get.
https://www.midwayusa.com/product/1022219533
From what research I've done, the dovetail red mounts are generally not regarded very well. They do sit really high like you mentioned and make it impossible to get a cowitness plus the height over bore is going to make it difficult to get a useful zero. My pistol platform is 100% Beretta 92 variants so sorry I can't offer much Glock specific information.