Normally you want to avoid bending your coax cables past a certain minimum radius (depends on the cable); one example I found said 75 mm (or 3") which would give you a minimum circle diameter of 1/2 foot. You can run into signal reliability issues bending the cable too sharply as the strain it puts on the center conductor and the foam insulation can cause the foam to compress on the inside of the bend and stretch thin on the outside. Over time and temperature changes the center conductor can eventually make contact with the shield, causing a short. Before that, though, the capacitance of the cable at that point will increase which may cause a drop in the higher frequency signals.
I know the DP34 and DPP44 say "Mount this Side Up" but that's for exposed environments. Inside your shed, you could straighten your cable runs by rotating your switches 90° and running them one above the other. These switches are solid-state devices so there isn't really an "Up" or "Down", but environmentally they may be more weatherproof when mounted with the Up Side up. The only reservation I would have with the DPP44 is the fins for thermal management work best when they align with a vertical movement of air; mounting it with them running side-to-side may reduce the heatsink's effectiveness.
Also, make sure you run a copper ground wire between the two switches as well as the ground rod. You'll also want to bond the ground rod to your service ground to prevent a ground loop which would be observed by a 60 Hz humming in your audio output.
I studied Electrical Engineering at Purdue University in the 1970s, but switched to Computer Programming in my professional life. I'm an amateur electrical guy, who learned about ground loops in-person installing my TV antenna systems in my two homes. There are other members on this site who install/installed Dish and DirecTV professionally and they should be able to correct any misinformation I may have presented here.
Thanks for documenting your tinkering and efforts. Learning should always be encouraged!