Its preference what you want to go with they're pros and cons with both. You can build your own canisters will save you a few hundred dollars. Just make sure everything on there is nice and tight. I don't like canisters mainly due to limited bio media you can fit in. With a sump you can add 3-4 times maybe more the amount of media and its cheaper and you can customize it with K1 to you name it.
Sometimes due to limited space canisters work very well. If this can't fit a sump or you wouldn't want to have one and build your own thats great as well. Both options are great.
Your tank has a built in overflow so its meant for a sump and probably has a bulkhead waiting to be plumbed to a sump. Like someone else said you would have to drop the water level due to this and you should be fine you'll lose maybe 10 gallons.
Sometimes due to limited space canisters work very well. If this can't fit a sump or you wouldn't want to have one and build your own thats great as well. Both options are great.
Your tank has a built in overflow so its meant for a sump and probably has a bulkhead waiting to be plumbed to a sump. Like someone else said you would have to drop the water level due to this and you should be fine you'll lose maybe 10 gallons.