Bot Spawns

Hi,
No trouble at all - You don't have to create custom individual spawnpoints, although that is an option.
The minimum you'd need to do is set your day+night spawn amounts, and set AutoSpawn true, then either reload the profile you've edited or reload the plugin.

That should get vanilla scientist npcs spawning.
There's one or two monuments where spawn 'Radius' setting may need increased, such as the Dome, but for most default should work fine.

If you want the npcs to have different attire or weapons, use Kits.cs from uMod to create some kits, then assign those to your profile via the BotReSpawn UI.

BotReSpawn will make the npcs act like murderers, running at you and swinging, if you don't put any guns in their kit and leave them with melee weapons only.

If you've any issues or other questions, don't hesitate!

My pleasure. If you've any questions at all, just ask.

Just so you know, multiple kits can be chosen for a profile and if you do that one gets picked at random each time an npc spawns.
It's possible to balance the probability by assigning some kits greater numbers than others,
but the basic requirement to get a single kit to work is just to set it to '1' in BotReSpawn's UI for that profile.

Also, I forgot to address "and to have them stay spawned with respawns only if they die. "

This is default behaviour. The only exceptions are event profiles, like AirDrop, where the npcs are killed off after their Suicide_Timer (minutes),
but all regular monument profiles and custom created profiles will have npcs that stay until they are killed by someone, then respawn after their respawn timer.