I would not suggest columnless supports for the plinth due to structural requirement reasons.<o></o>
Yes, beamless plinth would do provided, the following provisions are ensured:<o></o>
Convert slab into beam.<o></o>
Provide double mesh by providing rebar mesh at top as well as at bottom.<o></o>
Increase slab thickness for meeting such requirement.<o></o>
Check for the bending moment, shear force as well as punching shear at column locations.
Check resistances against lateral forces.<o></o>
This provision would save beam forms.<o></o>