I think the best would be a really high tolerance disc bubble level, the problem is that will only allow you to level left to right unless you mount it on an angled block at the slope you want for your table.

I can see a market for these if someone were to build them to a high accuracy with a 7 degree slope on the base.

I wasn't sure about if these apps need to be leveled or not and I read that they level against gravity naturally, but I wasn't so sure. They seem convenient but not as much if you need to calibrate them each time.

I decided to order a disc level and I'm going to make a 3d printable base for it that has it sitting at whatever angle you want your playfield. I think this should make it pretty easy to level . I'll post it when I'm done.

Here's what I came up with. Probably going to tweak it a bit and then I'll post it to thingiverse and here

PXL_20211116_010511306 (resized).jpg

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This is good advice. I'm trying to figure out the best way to ensure my disc level sits straight and isn't rotated and something along these lines sounds smart.

I decided to give it a mustachio. You lay the mustache along the top of the flippers and set the disc into it.

Will print tonight once the printer is free and if it works I'll publish it.

What are the most common angles people will want? 6.5, 6.8, 7and 7.2?

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https://www.thingiverse.com/thing:5139728

Done. I removed the post at the top because the level itself is not aligned with the mounting holes.

You have 6.5, 6.8, 7.0 and 7.2 degree versions. The mounting bar is optional but it helps keep the disc straight.

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https://www.amazon.ca/gp/product/B07P9YVF46/

That's the one.