Generally speaking, any mod uploaded to Deadly Stream within the last few years will be compatible with TSLRCM. (Though a mod may say it's not because that's the default setting and an update to the site a while back nuked the settings back to their defaults.) Everybody around here assumes the vast majority of the audience is going to want to play with TSLRCM installed, so there is no point in uploading a mod that's not compatible with it.
Any mods that pre-date TSLRCM should be assumed incompatible. That accounts for the majority of GameFront's archives, and whatever of that is still on the Nexus. Purely aesthetic mods like minor texture changes and maybe some head mods may be safe, so long as they're not editing any UT* or DLG files.
Unfortunately, a lot of older mods, such as the Ultimate Saber Mod, are not safe at all and the authors are long gone. We're in the process of troubleshooting and patching some of them via Deadly Stream's abandonware policy, but progress is slow.
When in doubt, pick whatever you like from Singgles' builds and what's explicitly marked as compatible with TSLRCM here. At least within TSLRCM's sphere of influence, most of the compatibility issues have been worked out. So long as the mods don't obviously do the same thing and use TSLPatcher where appropriate, they're probably be compatible.