I face different issue related to ClientMod Network.
Servers with low ping or servers nearest to me take longer to appear in the Server Browser.
I am not sure if same happens for everyone, but it does happen to me and some of my friends who have reported this to me multiple times.
There is no way to install Metamod and Sourcemod on CMLauncher.
If you just want Deathmatch feature, try using below commands :
If you want a proper deathmatch server with random spawns, set up a dedicated server.