Mounts tend to be proprietary to not only the brand but the model as well, with some mild variations.
Mounts are generally nothing more than replacements for your standard A2 flash hider. This means that they install and remove just as easily. If you’re going to SBR the gun anyway, you won’t be “stuck” with anything other than the fact that you may have a can that you paid $1k for that is only worth $600 on the used market.
The Gemtech Halo mentioned above or the similar AAC Omni are possible solutions as they are designed to attach to the standard A2 flash suppressor and can attach to many others. These were actually designed for agencies and departments that couldn’t, or didn’t want to, change out the flash suppressor. They have since found a niche in the commercial market with people that want to use the silencer on various firearms but don’t want to have to shell out $100+ for each mount.
5.56 silencer selection is a tough thing, largely because the market is so saturated. The irony is that the differences between the various makes and models is so small as to almost negate all the hand-wringing that many first time buyers go through. I know that before I bought my 5.56 can (an Ops 15th model, FWIW) I was agonizing over it and reading and posting like a madman all over the internet trying to make sure this was the can for me.
My suggestion would be to sit down and list out the features you’d like a can to have. Sound suppression level, light weight, shortest overall length added to weapon, finish, reputation of manufacturer for warranty service, etc. Then put those features in order according to what you think is the most important thing to you. Then start researching. User the “search” feature on web forums more often than the “submit new thread” feature. 
See if your list of priorities changes.
For example, I think you’ll find that most knowledgeable people will agree that virtually all of the top selling 5.56 cans wind up having pretty much the same level of noise reduction for a given size. The arguments that you will see about this one being quieter than that one ultimately come down to one or two decibels at most and if the cans are shot side-by-side most people really can’t hear much of a difference. Given this, length, weight, and attachment method may move up on your list.
Or, you can just find a dealer with an AAC M4-1000 in stock and go with that. By all accounts it’s a decent can at a decent price and will serve 99.9% of the commercial shooters more than adequately. Whatever you do don’t order any AAC products from the factory! Find one in stock somewhere and buy it. They measure lead times in terms of months over there, and some people have waited up to more than half a year to get their silencer. If you can’t find an M4-1000 in stock somewhere, look for a YHM Phantom in stock and buy that. It’s right at the same price and by all accounts it’s 99% of the can that the AAC product is.
