Can any GL.iNet employee confirm that these three routers and future routers support STR MLO? There was a bit of controversy started with a Rtings article. If GL.iNet routers support STR MLO, how is it validated?
For the Slate 7 Pro and the Flint 4, can the 2.4 GHz, 5 GHz, and 6 GHz bands all operate independently as three different networks if I don't use MLO? In STR MLO mode, how are the bands utilized?
Yes they will function separately if you don’t enable MLO, but I don’t think it has STR MLO. I don’t have a unit to test and verify though.
Which router do you have?
A flint2 but it’s dead.
Slate 7 Pro supports STR. This has been asked a bunch of times before. Search is your friend.
I recommend reading some topics about this on the openwrt forum there is some interesting discussion on this 
I learned from their posts it is still extremely buggy even on vendor firmware, and they think maybe the third generation of routers with wifi 7 are gonna fix it...