Just as a matter of interest Marlborough's British Artillery at the Battle of Blenhiem was under the command of a Colonel Holcroft Blood and it consisted of (Left Wing) 6 Culverins (9pdrs) supporting the attack on Oberglauheim, 10 Sakers (5pdrs) & 4 Howitzers supporting the attack on Blenheim, 24 x (3pdrs) 16 of which were from the British train.
(Right Wing) 16 x (3pdrs).
Blenheim was fought in southern germany so no Dutch there, but Marlborough's other three great victories all took part in Flanders where the Dutch played a big part.
Yes this isn't Napoleonic Artillery I'm affraid, no horse artillery in this period.Once placed it usually never moved again possibly only to reline itself when firing on a different target.Most of the artillerymen were no more than civillians.Few guns in any one action and if you look at the numbers used at Blenheim above for wargaming purposes I'd divide these by 6 giving you 1 x 9pdr, 2 x 5pdrs (these are still field guns with 3 crew each), 7 x 3pdrs (light or battalion guns with 2 crew each).
I'd go with Barry's advice 1 x 3pdr per brigade.