This is looking more like a build log than not.
Getting the top GPU connected, it looks too close to get a straight fitting on each end and then flexi hose (as opposed to hardline) but a number of possibilities come to mind:
1. Swap the in/out on the top GPU - does that make any difference to the angle?
2. a 90° fitting on each GPU and then link the two with a coupler (G1/4 male to male). If necessary you can use a G1/4 extender to lift one of them. Or 90°, 90°, coupler.
3. 45° fitting on each GPU and then straight between them - either piped or coupler.
4. Two triple rotary snakes and link them. Expensive and may be ugly but it'd give you the flexibility to move it around to take up the slack.
5. 90° out of each GPU, hardline fitting and then a U shape to link them.
You'd have to see if any of those fit.