SWCG for both pool and spa

[mtrb7]

I have an in ground pool and an in ground spa that are separate (no spillover) but share the same filter/pump system. I would like to add a SWG (Pool Pilot Digital?) and had planned to place the inline swg after the heater but before the pool/spa return diverter. The installation guide says to install on the pool return only. If I do that and balance the diverters to pump and pull to both the pool and spa, will both the spa and pool chlorine levels be regulated by the SWG?

For those with pool/spa combos with no spillover, is that the recommended install?

I want the SWG to regulate both the spa and the pool.

Any help is appreciated.

Thanks.