EMI / RFI filters for reducing dimmer-switch noise (what is available, where to install)
The problem with those modules is they're designed to go in a product

The power-line RFI filter modules you're looking at aren't useful for what you're trying to do.  Why? Because they're designed to go in a finished product, and thus are UL Component Recognized (with the RU, or Rather Useless to us, mark), vs being UL Listed as something that can be installed standalone into mains wiring.

(If you can find someone willing to sell you one, there are UL listed facility EMI/RFI filters available; however, most of them are either combination EMI filter/SPD units, and those that are standalone EMI filters are rather hard to find/obtain.  Furthermore, heavy-duty facility EMI filters have relatively high line-to-ground leakage currents, which makes them not get along well with GFCIs and many AFCIs.)

However, there is something you can use to fix this

However, if your dimmers are emitting RF noise, you still do have a couple options.  First off, upgrading to better quality, specification grade dimmer switches (such as the better stuff Lutron, Leviton, Eaton/Cooper/Arrow-Hart, or Legrand/Pass &amp; Seymour make) will often get you dimmers that go the extra mile on built-in RFI/EMI filtering.  If that's insufficient, one can try a Lutron Lamp Debuzzing Coil in series with the dimmer wiring, as per Lutron Application Note 519.