The wargaming rules I have played (WRG, Tank Charts, GI Commander, Challenger, Mein Panzer, Jadgpanzer I and II, or PanzerWar) have not placed high importance and game-dynamics on HQs the was some rulesets (like FoW) do.
I have modelled command stands for some time. But I have only recently started modelling specific HQ bases.
Here is an example of a command stand. In this case, a 2-man platoon command stands behind a rifle squad. These are from my WW2 French Armee d'Afrique troops.
Here is a better look at the command stand, on a mat that shows the colors a little better. I use GHQ individual infantry as much as possible -- for this force I chose Romanian infantry. The helmetted officers work well for platoon and company command elements. I bolster the officer with an NCO made from a grenade-throwing rifleman figure, with the stick grenade clipped and the arm bent just a bit. (This is a common mod for my infantry command stands.)
Here is an actual HQ stand. In this case, this is an HQ for my French continental forces. The officer is a GHQ Italian officer figure (never understand why they give an Italian a kepi!). The other figures are GHQ US Artillery crewmen, which I use in a lot of places where I want figures without rifles.
For my Romanian force I tried something different.
This is a field telephone unit I made from a two-man 60mm mortar team. I clipped off the mortar, bent the loader's arm to his ear, added a box to be the phone, and put a wire real on the gunner's back.
With this I have a 2 piece HQ. A commo team + a command stand = and HQ.
So here is the Romanian command stand. In this case an officer figure, an NCO figure (clipped gredadier), and a prone observer with binoculars.
Just some of my ideas.