Mocap Fusion supports up to 24 points of tracking. This limit includes both the base stations and the tracked points. So if you have 2 base stations, you can only use the remaining 22 points for tracking.
Both the headset and controllers can be replaced with trackers if need be.
For a more in depth workflow on this, see: Using SteamVR without a VR headset
Any hardware connecting to SteamVR is supported, but here are some proven examples.
Quest 3S + slimeVR
If this setup works for you, additional slime trackers can be purchased for better tracking (Up to a total of 14) https://docs.slimevr.dev/server/putting-on-trackers.html
To purchase slime trackers; see SlimeVR Tracker
Since Meta Quest headsets use Inside-Out tracking, controllers & hand tracking outside of the view of the headset cameras won’t track accurately.