Does this sound right & proper?

Colleague has 2 X 16A backup immersion heaters in a heatbank

They have been wired on one circuit on a 32A MCB, (on a new 2X RCD
split CU).

They are seperately switched, in two locations viz:-
1) next to heatbank via 2 X switched fused spurs (?) with a
13A (plug
type) fuse in each
2) in adjoining room via 2 X 45a DP switches (more convenient
for
residents to control)

Queries
13A fuses for 16A immersions?
45A DP switches - wouldn’t 20A DP do and be a bit cheaper?

thanks in advance

JimK