IMHO canister filters are not the best but still effective.
I recommend you start the system with macro algae right from the start. that way the system will be balanced and stabilized from the get go.
Macros do best in a refugium which in its' simplist form can just be an in tank partition.
You can build an HOB drain to a sum with $20 worth of PVC. And it will be just as reliable as any drilled setup.
If you do go sump:
1: test power out to insure no floods.
2: test normal operation returns when the power returns.
3: test there is no flood with drain failure. (blockage, siphon break). The sump should run out of water before the display floods.
my .02