Firewalla gold + dns config?

with the free dns resolvers from controld on my firewalla router

do i need to use the Secure Resolvers with the Legacy Resolvers for any of the offered options to have them work well

i want to use the 76.76.2.5 & 76.76.10.5 as my primary & secondary dns options for the wan input on my FWG (firewalla gold)

would doing so work the same as when using just the secure version https://freedns.controld.com/uncensored or do you have to use both together to get the full benefit

or could i mix an match by using the uncensored dns legacy resolver on my firewalla router wan input an then use the https://freedns.controld.com/p2 from Ads & Tracking in the custom doh server settings , is ther any benefit or draw-back in doing this ?