I don't think there is a one size fits all compressor for mastering a stereo mix. It depends on what the stereo mix needs.
The expertise of the mastering engineer (when I have been in the same room), has been to know what needs to be done to the track, and what tool is needed to get it done.
I like a Pico compressor for the transparent and fine control. I also have a 33609, SSL, and LA2A. All very different.
Saying you want to 'glue a mix' makes me think the mix isn't done. I've seen a mastering engineer use multiband compression in that case, unless he has the stems. Unless you really want to go crazy with hardware, you'd do that ITB.
And starting with stems is helpful to avoid trying to 'undo' too much compression in the stereo mix.
My LA-2A is amazing at gluing the mix together, but I apply it to the stems, not the mix bus. If you do want to operate on the full mix (or even the drum stem) you'll want the flexibility to high pass the sidechain. Unless you want the whole mix to be smashed when the kick drum hits.
A 'mastering' compressor will also typically have stepped controls and a 'mono' compression.
Figuring out what needs to be done and how it can be done is the hard thing to learn. Best way is to get in the same room with some good tools and someone who knows how to use them.
Just my thoughts, I'm not a pro though - good luck