Technically you won’t need a separate priming tool for the breech lock pro press , just pop the primers in by hand to the priming arm.
If you want a hands free system then you’ll want the priming attachment for the press.
If you use a separate tool you tend to negate the advantage of the press.
As yet I’ve not encountered a problem just picking up the primers and also use a Lee ram primer for rifle cases.
However if you end up reloading rifle cartridges then a separate tool by speed things up .