Frankly, I would be happy if there were none. To me, they distract from my already limited ability to visualize the action of July1-3, 1863. I particularly dislike the Eternal Light Peace Memorial.
But then, that is my inability; most are pleased to have meaningful memorials and markers to help understand and appreciate the battle. In a day when interest in our history seems to be waning, that's a good thing.
I suppose it depends on what monuments are proposed, their size and what they specifically commemorate.