Comments FWIW:

Not a fan of having t-track embedded in my counter tops. Collects dust, dirt and is PIA to clean.

No longer have a miter station, but the couple I built in past used a track mounted on vertical fence that aligned with saw. Kreg sells a version.

My favorite was the Biesmeyer miter fence rail system (no longer made). it used a rectagular tube as fence rail and clamped a stop on top if it. It is easy system to DIY:

One issue with miter saw fence is the wasted space behind the fence rail, and is a reason some folks remove them. If you have a large sliding miter saw, could end up wasting 16-18" of counter space behind the fence. Down sizing my work shop and the wasted space is the reason I not longer have a miter/radial arm saw set up for cross cutting anymore. Congratulations if you have the space.

YMMV

 

A lot of people mount the tracks on top of a fence FWIW, and use a drop down stop block. UIt could be inset, or not. Kreg sells some track that wraps around a fence top. That piece of combo track you listed really would work best inset into the table, or I am not sure how you would use the miter slot?

For my $$$$ I would rout out a channel, and mount it in the routed Dado. They work well that way, and with planning you can have 2x structure under it so screws will have a good bite, and offer you a firm attachment.

As to Capn's inability to clean his, I guess he doesn't have an air compressor in the shop. I just blow mine off, and have never had any issue keeping T Track clean.

 

On my miter saw I don't use a fence or tracks. Any hang-over I get out a 'roller support stand'. I do clamp on a fence to the miter saw if I'm doing multiple same length cuts. I do have the right side bench level with the miter saw surface. It's nice to have a fence with the miter saw and stops on the fence, but I feel the fence limits the full use of the work bench for other things. To obtain full use of the bench where the fence would be, you could put in some removable bench dogs that you can stick in and remove when not in use.

The Rockler track and stops on the fence that 'therealSteveN' shows is, what I use on my table saw sleds. They work nicely.

 

T-track is easy to clean as long as you have air. Pssssst! and its clean. The miter gauge (if any) cleans the track as well.

Incra fence with flip stop will give you repeatable accuracy.

Incra Flip Stop fence

 

Putting all ten of my thumbs up for this one. Before the Net I built a station and a stop system with the stops off the fence rather than in the table. It was a well worth it pain. The tracks make the job so much easier today, so go for it.

IF you build the table the miter sits on wide and low enough, it can take any miter on the market. To make the table adjustable, place another piece of ply over the top of the permanent, solid base and have four bolts down into it at each corner. Adjust the bolts up or down for the different miters. Use two nuts to lock the position (and washers between them and the base, if necessary).

PS Not a stupid question, it and the answers will help many.