Even though I think the price for Grandal and Realmuto is likely to be higher than what I would want to pay, there is no harm in checking in on the price. And there is a price at which I would have interest in these guys.
In the case of Grandal if the price dropped to 3 years and an AAV of 14M, I would be interested.
In the case of Realmuto, I would offer them a choice of two of Wentz/Muller/Allard.
In neither case would I expect that to be a winning bid. But you never know.
I think the Plan A for catcher should be one of Maldonado/Suzuki/McCann/Lucroy to work as a tandem with Flowers. And keep an eye on Cervelli, whether in the off-season or mid-season as Plan B.
With this sort of approach, we can be patient and benefit from the tendency of free agent prices to drop as spring training nears.