Probably not worth it. MTB pedals/shoes are good because you can walk around off the bike much easier.
If you’re walking you’re doing it wrong.
Roadie pedals are far larger and therefore stiffer, and more stable. Shimano have some float and are probably the most popular as the cleats last much longer than Look (dunno why, they just do). Look have a bit more float, speedplay are the daddies of float but £££ to match (and to get the most out of them you need speedplay specific shoes rather than an adapter).
I don’t think more float is necessarily a good thing with cleats, the right amount is a good, but more isn’t better, if your foot doesn’t move much during the pedal stroke then a zero degree float will keep it in the optimum position, where float would allow it to flop around.