IM Helio Heating Elements Placement

[Thresher's Reef]

Hey y'all! I need some help due to running into a wall while building my first reef tank. I have the Innovative Marine 25 gallon lagoon and bought a Helio 2x100w smart heater setup, but I am having trouble figuring out the best place to place both elements because I would like redundancy. My setup is running the standard 326 gph mightyjet pump that comes with the AIO which makes it where the only way I can put one of the elements in the return chamber area is vertically which scares me if the water level ever drops for any reason. If the element holder that comes with the controller wasn't so large, I would most likely be able to place one horizontally directly behind the return pump.
My plans for the filtration area (from left to right) are:
1st chamber-IM caddy with floss and carbon after cycling
2nd chamber-InTank fuge basket (in hopes of creating a refugium w/ chaeto one day)
return chamber-326 GPH IM MightyJet return pump
3rd chamber- trying to leave open in case of need for protein skimmer or media reactor one day
last chamber- InTank media basket mirroring other side with floss and carbon

How can I get both elements in comfortably with this setup? If anybody has these elements and system w/ the IM 25 Gallon Lagoon, I would love pics to get an idea please! I unfortunately do not have pics yet and I am not currently home to take any to show what I am talking about so I apologize for that as well.
Thanks in advance everybody!

 

[BairCorals]

Might be able to raise the pump up some so you can fit them under the pump? Like cut the return hose a little shorter? The heaters are 5-3/4" right? Should be able to fit down in there flat, no need to use the heater holder in the application, would never run dry because the pump can't physically pump water below it.