I don't know from personal experience, but I have read that for Bet19 and Gameday, it is OK.
The SportingBetUSA, SportsBook, PlayersOnly (etc., etc.) crew frown on placing bets at the various books that collectively surpass the maximum bet limit at an individual book. If you want to bet a LIMIT-PLUS bet, they prefer that you phone it in to only one of the books.