Similar issue with 3 bikes, the wife and I have reasonable weight FSR’s and a light weight 1×9. Had a look at the floor / ceiling ideas and already had similar in an Ikea set up. Basically two telescopic poles that extend to the ceiling then clamps that go round with a variety of hooks etc. Think light weight scaffolding. Called Stolmen range from memory
Have it set so the light bike goes up high, wifes in the centre and mine at ground height, Taking off the front wheels means they can be stacked with handle bars not jutting into room. Two poles, hook for back wheel on one, two hooks on other for stem / handles.
Alo has a set of drawers that fit into the system which holds all the spares, tools and associated clutter.