FrenzyNoBotCount

This mod allows you to have Frenzy and still set your own bot numbers. The enemies are the same as normal Frenzy.

After you add the mod to your server, use the mutator "FrenzyNoBotCount" to launch the server instead of "Frenzy". If it works it should be frenzy mode. Do also include ModDownloadTravelTo, so the server refreshes the map after the mod is loaded which loads the mutator. (Otherwise the first game you play after starting the server won't have the mutator working)

Example command line:
InsurgencyServer.exe Farmhouse?Scenario=Scenario_Farmhouse_Checkpoint_Security?MaxPlayers=12 -Port=27022 -QueryPort=27023 -log -hostname="Test server" -EnableCheats -Mods -CmdModList="95456" -ModDownloadTravelTo=Farmhouse?Scenario=Scenario_Farmhouse_Checkpoint_Security -mutators=FrenzyNoBotCount
(You also need an API key set up to use mods in your server. Follow the official community server guide to get it.)

Note that I also set the max bot count to occur at 16 players. There will be less bots than the one you set if there are less than 16 players.

For example, if you want a 8 player server with 30 bots, then you should set around 60 max bots in the server's config to get 30 bots when there are 8 players. (10 min bots - 50 max bots would also work, you get the point)

From my testing this also works with "Fast Respawn" (solo mode) style servers.