LED driver wiring question

Okay, I'm still working on the project I posted about here.

I ordered some [Convoy buck/boost drivers]((https://convoylight.com/products/22mm-buck-boost-driver-for-uv-365nm-led) ) and LEDs. One question I have, though, is whether it matters if I put a relay/switch after the driver rather than before it. I think it shouldn't matter, but I've already hit a few spots in this project where what I thought I knew turned out to be wrong, so I figured I'd check in.

Basically, I designed and 3d printed an 18650 holder that can holds a 22mm convoy driver on the positive end and a bump terminal on the negative end. I was planning on just wiring that up, then putting my relay on the output of the driver to control the LEDs, but I realize that's not how they're wired in flashlights, so I thought I should ask if that will be an issue (the main concern I have in mind, I think, is power draw by the board while not under load), or if it doesn't really matter.

tl;dr: using a convoy buck & boost driver board, can I cut power after the board, or do I need to do it before the board?