Not a bad idea to have a 'basket' over the pumps and float switch.
Also two pumps running off one float switch gives some redundancy.

IMHO the best way to go is a float switch and two small pumps, then
higher up above normal bilge water levels another float switch and
much larger pump. Ideally run each off different batteries.

cheers,
Pete.

I agree about the basket, if you have enough space. I don't, and mesh which
is small enough to protect the pump from debris soon blocks up with gunge.
The Johnson float switch has an in-build strainer, so it's OK, and I just
have to regularly flush the bilges and be careful about housekeeping when
I'm doing carpentry on board ...

I've doubts that having two pumps off the one float switch makes things more
reliable. If either jambs, it would blow the fuse .... If you have
separate fuses for the two pumps, you still need a larger common fuse to
protect the switch and wiring.
David