I tested the Lens Nest with a range of lenses for DLRs and mirrorless cameras. Lens Nest recommends that the maximum height of lens stored in a Lens Nest is 22cm. That means that most 70-200mm lens just fit.
It didn’t take long to find the appropriate ring to use with Canon EF, Nikon F, Fujifilm X, Sony E, L-mount and Micro Four Thirds lenses. However, the large Nikon Z mount only fits in without a ring and it needs the spacers to be used to raise the barrel away from the edges of the Lens Nest recess. If you don’t do that, it’s a nice snug fit, but when you lift the lens out of the Lens Nest, it lifts the sides a little, making the unit less stable.
I didn’t have a Canon RF mount lens to hand, but at 54mm in diameter, it’s 1mm smaller than the Nikon Z mount. That may means the lenses fit without a spacer, but it doesn’t give much wriggle room.
One issue is that the base unit of the Lens Nest comes out fairly easily, so if you move the Nest around or store different optics, you may need to flip it over and refit the base.