Yeah, the distance between the holes on intellijel 1U tiles are a different height/distance than the rails in the synthrotek case, so it means you can only get one row of screws to hold the module in place. It’s perfectly solid, everything stays in place, no flex when punching in/out jacks. I was taught long ago by a friend that 2 screws is plenty, in his recording studio every single unit in his 19" racks are held in with just two screws.
There’s a slight gap between the 1U tiles and the 3U modules, though I suppose I could shift them up to use the other rail. And the sliding nuts in the unused rail are loose and slide around, but whatever, everything works. Ha
Edited to add a pic:
Though I suppose it’ll bother those afflicted with eurorack OCD. I’m not one of those…yet.
Oh yeah, there was one other thing. The intelligel tiles only came with 10pin cables, but the power strip in the case uses 16pin cables, so I had to buy a 10pin to 16pin cable. Not having any power issues, everything is working.