Nope, with Head of Object it is not possible to go below the bottom of the wall, with sill you can give a minus value and by that make them go below the wall.
And in the wall Style you can lift the bottom part of the wall up with Bottom elevation so it looks like the door stand below even if it is inserted with Top of Object, typical use of bottom elevation is on a interior wall, it should stay on the same worplane as exterior walls but if there is a slab involved you maybe want it to looks like the int. wall stands on top of slab.
TC need it that way if you want to add a layer of tiles i.e. in 1 rom by using a "Tile slab" inside that spesific room
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