Redglobe, I'm v.close to making a decision to buy the Salvation w. Terminator arm. My only other possibility is the Technics SL1200-derived Inspire Monarch.
I can tell you if you use it with Vic's Terminator T3Pro linear tracking arm (his preference, and all Salvations so far have been fitted with his arm), because of proximity of arm base arrangement to platter, it will not accommodate an outer ring.
Vic really believes, contrary to popular opinion, that use of rings/clamps damps the life out of lp replay.
Having heard his set up with the Reso Mat, I can only agree with him.
If I go down this route, moderately unflat lps will play ok, and I'll use something like the Vinyl Flat or Furutech LP Flattener with my handful of severely warped lps that may not work without a ring/clamp.