Can I use one voltage divider to bias multiple points in circuit?
It all depends on how you make that virtual ground and how you load it.

A virtual ground is just a DC voltage used as a reference voltage for (usually) opamp circuits. This can be used to prevent having to use a symmetrical supply like +5 V and -5 V. Instead we use 10 V and make an internal 5 V as a "virtual ground".

You can bias 16 (or more) opamp circuits from your virtual ground as long as you take care that your virtual ground is not influenced too much by the circuits connected.

If you use inverting opamp circuits and directly connect the virtual ground to the + input of the opamp, no current is drawn from it so you can bias many opamp circuits.

An inverting amplifier, here the + input is grounded but that can be a virtual ground as well:



If you do load the virtual ground with each circuit then you have to make sure the virtual ground can supply all those currents.

To prevent the circuits influencing each other you might want to filter (Resistor in series, capacitor to ground) each virtual ground but that increases your BOM.

Also it is not so much the DC biasing current as it is AC currents resulting from the signal being amplified which can cause problems with a shared virtual ground.