How to keep multiflow lines flat on ground

I've done DWC and NFT a bunch but I scored a multiflow system where I needed to replace the tubing in between pots. I bought some new hydrofarm soft tubing but it doesn't like to lie flat on the ground preventing uneven fills. I dont want to put a weight on every raised line. I thought about heating it up to try and get the "curve" out. Any ideas?

Nevermind, I used a hairdryer on high to soften the tubing and get it to lie down. If I knew this was going to happen I would have straightened it in hot water first.

There a pain in the arse mate ! I had a wooden floor ,so I used plastic u shape brackets screwed to floor to hold em in place .