NFL teams are allowed to meet with 30 prospects each year, not including local ones, and it seems as though the Seattle Seahawks have just about hit their limit. (Note that reported lists are sometimes uncomfirmed and conflict with one another at times, which you’ll see below.)
One important thing to note about pre-draft visits is that they are so close to un-predictive of actual draft/signing results that they might as well be meaningless in that regard. They are meaningful in that they tip off - to a degree - what Pete Carroll and John Schneider are looking for in prospects, but the vast majority of pre-draft visits do not end up with the particular team you’re looking at pre-draft visits for.