Prober Pools in GTM

If you are running a monitor from a GTM, that IS the Prober. The GTM SYNC group will determine which is closer, and use it. Unless you build a Prober pool. If you define a prober pool, assign it to the DC your generic host is configured in. Configure the Prober pool to GA LBing, with the Primary GTM listed first,..... You will have what you want.

David