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I think I can finally add some pictures of the female in question. Sorry they aren't very clear but she would not sit still.

Hi Shrimp can and do climb up things including airlines and heater cables so i would say if you had a nice bit of foam at the top, that was all wet for them, then they will use it to climb into the next section. A very close fitting lid would help but then you would have to move the sponge filter to going over the back not the side. From memory, and mine is a bit dodgy, the reason for not putting glass heaters in the horizontal position is because there is a greater chance that the internal elements can touch the glass sides and when it is on that can crack the glass. Another consideration is the seal between the glass and plastic cap will have a greater water pressure on it at the bottom of the tank. Not a lot but if you have cheap heaters that might make the difference. There is the choice of stainless steel heaters now that are not that much more expensive than glass. They are fine to go horizontal.