Amazon.com: Rebuff Reality TrackStrap Vive Ready FBT Bundle for Vive Tracker 3.0 and Original Tracker - Includes 2X Foot Straps and 1x Belt - Popular in VRChat for Full Body Tracking and
I think i have the answer to full body tracking for the quest/quest 2 in stand alone mode : r/OculusQuest
NEW CRAZY GOOD Full Body Tracking for ANY VR HEADSET (QUEST 2) - YouTube