Rick, there's one reason i would advise not seasoning with Mrs. Dash when freezing portioned meat. Those seasoning mixes contain a substantial amount of dehydrated garlic which when frozen over time develops an unpleasant dominance in the seasoning's flavour profile, and it increases. Even if you enjoy a lot of garlic, unfortunately it's an unpleasant aberration of the flavour.
As Ember points out, there isn't much if any benefit to seasoning before freezing.
Frozen meat can be SV cooked from the frozen state and many Anova users do it for the convenience.
As an alternative, you might find it beneficial to SV cook your portioned meat, ice-bath chill and then freeze. Reheating is done at or below the original cooking temperature to maintain your precise degree of doneness.