What is the best track placement for multiple glue gunner types?

Given that different types of glues do not stack, it makes putting all three tier 5 glue towers close together counter-productive. So, my question would be then what is the best way to place all three Tier 5 glue gunners to de-conflict their glues and maximize their effectiveness? Which one do you want towards the front of the track, and which one do you want towards the end, or middle of the track?

This question is particularly most relevant in freeplay mode when going past round 100 (when you're exhausting T5 tower placement on the map), as generally a single T5 glue gunner (supporting other towers) is all you need to get to round 100.