Fiala seems like a fairly good comp - both high picks (#9 / #11 overall), only ~ 2months apart in age.
Over the past 3 seasons they have similar stats:
Fiala - 198 GP, 75 G, 118 A, 193 PTS
Meier - 193 GP, 79 G, 81A, 160 PTS
Fiala signed an 7 year, $7.875M AAV contract less than a year ago which included one RFA year.
I understand the cap should be going up and Meier might get an 8th year - though that 8th year shouldn't drive the AAV up considering he'll be 34 years old that season and on the decline.
I don't see Meier getting over $9M.