Just wanted to quickly report back on these:
koolance rotary fittings.
My goal is to stay under 57.5mm motherboard-to-panel distance (to fit in my T1 in 3-slot mode, while clearing RAM easily).
This height is represented by the cardboard cutout you can see behind the fittings.
Even when using these fancier screw clamps for 10/16 tubes shown in the picture, I'm just a hair above 57.5mm.
With the more typical spring clamps you're easily under that height - and especially if you were using 10/13mm tubes.
So at least for soft tubers, I would definitely recommend these over the
koolance low profile elbows, as those are more expensive and can easily cause connected fittings to collide with RAM, the Aquanaut top plate or the aquanaut AM4 socket screws, depending on the style of fittings you use and the routing direction.
And if you're curious: Against some reports I've read on reddit, the EK ddc heatsink is too tall for the T1 in 3-slot mode by about 3.5mm.
I'm debating if I can manage to sand it down by that amount just with sandpaper, but I'm likely just dropping it altogether since it seems like its not even necessary for the PWM versions of these pumps.