The SME etc dosent reduce noise. It just redirects it downrange. If you're in a house, well it won't change a thing I don't think. (If it's the same device I think it is. Been a while since I browsed those so I could be wrong.)
I have a small can I chose for similar reasons. I chose the Rugged Razor. Little chunky since it's a qd mount system but it's crazy well built and keeps the package small. It's pretty darn quiet too. Not the most quiet... but great for it's size.

 

there is no law of physics that prevents a structure that traps gas fron dampening a pressure wave from a muzzle blast despite whatever it’s “classified” as

this gentleman performed a reasonably well designed test of various muzzle devices on the rattler, and actually showed a pretty significant behind the gun decibel reduction with a Noveske kx5. not too surprising considering it’s essentially a single baffle suppressor (shh)

 

Omega 9k comes to mind. Pretty sure its rated for both supers and subs. Then there’s the Omega 300.

 

Omega 9k comes to mind. Pretty sure its rated for both supers and subs. Then there’s the Omega 300.

omega 9K is within the size profile I’m looking for, but requires a minimum of 8 inch barrel for super sonic 300 blackout

 

CGS Mod 9 or go with a 30 cal can like a Nomad 30. They sound great.

 

this looks like a great option, but says it’s limited to 300 blackout subsonic

 

I use Wolfman | Dead Air Silencers on my 9 inch virtus 300 bo

 

I have a Surefire 7.62 mini on my AAC SBR that’s pretty short and works really well. It’s an older design I bought years ago but still one of the best I think.

 

Abel Theorem S is under 6" and under 11oz. The Otter Creek Polonium S is slightly shorter and slightly heavier but a solid can. I really like the new Radical Defense cans. They meter really well and are a low back pressure. The CS-3 is a 30 cal can, 5" long and in titanium, is 8oz.

I personally have two Huxwrx 30 cal cans including the new Flow 762 which is about 11oz. Amazing performance. I also have the Diligent Defense Enticer S Ti which is 8oz. with mount but about 7" long. Extremely quiet even with .308 supers. Can't recommend them enough.

Stay away from ANYTHING Dead Air at this point in time. That company is a complete **** show with zero QC and virtually no customer service. They don't even make their own cans. Nothing but a marketing company that contracts everything out. Just google Sierra 5 issues. I'm a recent victim of their three ring circus. Just got my can back after three months of waiting for them to fix it. It arrived, brand new, damaged with a cracked rear baffle.

But seriously, take a hard look at the Radical Defense. I'm a big Huxwrx fan but the RD stuff is kicking *** in tests vs. the competition. CS3 Compact Suppressor - RD USA