Tanks are useless in penny packets, devastating in large spearheads; just as the French found out in 1940.
One option is to build a phalanx of French tanks and then reinforce the breakthrough with British infantry before the enemy can counter-attack. Or use American infantry to shield a British tank army, as the UK can usually spend more on tanks than France.
Austria-Germany can do the same on the western front; Germany-Austria in the East.
But the main use of tanks is to convert an industrial advantage into victory by effecting a breakthrough into enemy tt, ending the stalemate. When the Allies start building a large tank army its usually the writing on the wall for the CPs.
Personally, I’d like to see tanks made available to buy a round earlier.