This is how I'm using the inkbird's on my setup. I let them manage the temp (so yeah, 1 deg swings, bleh), and the APEX handles out of norm conditions. ie, turns off inkbird if temp gets too high and alarms if temp gets too low or turns off the inkbird if it gets drastically lower (probe fell out/probe error).
I'm actually mocking up a PID controller for temperature control at the moment. With the super simple titanium heating elements (no circuitry, just a coil of wires) it should allow me to reliably keep within 0.05 of a degree in my tank. I just need to source a more reliable solid state relay and I'll have it done-ish. The one I have I'm unsure if I'd trust it on my tank. I'm still trying to find somebody who's done this or can tell me why it isn't the normal method for controlling heaters.