I'm planning on the same thing for my tank, I was originally going to go with inline but I don't think I can make it sufficiently leak proof.
I saw some insta brand ones cheap on ebay that look clean. Not as nice as the ones linked above, but perhaps less obtrusive. "ISTA CO2 Pipe Holder 2pcs 4/6mm AIR LINE - Airline Tee tube tubing valve pump"
I just ordered "The soft tube fixture mount for dosing pump for 4 tubes"
LOL, I couldn't figure out what you meant then I googled it... I love ebay descriptions sometimes. Let us know how she works out. I'm trying to sleuth out how I want to handle the exposed nature of the dosing lines. It's not an easy task to cleanly do with a rimless tank. I'm leaning towards "J Shaped Glass Tube". I have the U tubes, but I think they will be too short. I need to keep them out of the water to break the siphon. I also need to try to see if I can easily cut one of the sides to shorten it up.