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moocher-
Yep. It won't alter the space being used either, so no awkwardness trying to fit a u- / j-bend waste.
Just make sure it's the right way up...
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This one you can, and is what I have as a temp on a washing machine /dishwasher before the real plumb job is finished.
https://www.screwfix.com/p/floplast-pedestal-trap-white-32-x-32mm/17119
Looked at a similar straight trap and was told by the person in the it was horizontal not vertical use, but was a different brand, and the pedestal trap was a fith of the price.
EDIT: looking at the videos of the waterless trap mentioned and can be mounted horizontally or vertically. So wonder what that was about.
NotThamesWater
lynx
You need a fanny trap
Cut down the waste pipe, install the trap, and stick a short length of the discarded waste pipe in the top