Yeah, let's see some photos. I have been waiting to buy a new iMac 27 since first seeing "dat screen" in 2014. I'm saving money and biding my time while specs get better and better. I am thinking about a VESA mount, to have my whole desk clear and enjoy height adjustability.
All iMacs can be purchased as VESA-mount models. Apple shows them at their site, pictured with a sketch of an actual mount arm installed. That model does NOT come with a foot, only the VESA mount. The arm that you use is up to you. https://www.apple.com/shop/buy-mac/imac-vesa/27-inch
Um, yeah? Lots of pictures on the 'net
It's easy to find those. A quick google for "imac desk mount", and you will see dozens of different setups.
You will even see some with those cobbled-together setups using the iMac foot adapted to a VESA mount.
My earlier post was not an attempt to make you think that you haven't looked for those photos --- only pointing out that the VESA mount model is quite versatile, adapting to a large number of VESA-type mounts, and also that the actual mount used is entirely up to user, and not really limited by the iMac.