Form 1
Maxnomic / NEEDforSEAT
Noblechairs
Secretlab (Standard armrest versions)
Razer Enki
https://docs.monster.tech/s/manuals/doc/universal-base-chair-mount-HLJUSRgLLL
Suitable for gaming chairs with the mounting points close to the edge.
Mainly useful in case Form 2 places the mounts too far out.
DIY Special
Flexfit/Staples Hyken
This chair may have a set of unused mounting points in front of the actual armrests.
After drilling them out, you can use these to secure the Form 1 plate.
MTSIM MFC
Alternative to Form MFC/MPS, potentially useful if you want the mount itself to be further back.
Not compatible with armrest use.
Reversed Form 1 via Form MFC/MPS plate points - Custom hardware combo: VPC Collective + Z-adapter
Reversed Form 1 via Green armrest mounting points