Who owns the monuments is the primary factor.
In New Orleans the city council decided to take down the Confederate monuments. That was well within thier powers. And a future city council will have the power to return the monuments.
I actually went to a rally at Lee Circle a couple weeks ago as I opposed the removal of the Lee statue.
My reason for opposing its removal may be different than others. I saw the Robert E. Lee statue and Lee Circle as a city landmark, both cultural, historical and geographic and a vital element of the city.
But it was not my statue, it belonged to the City of New Orleans.
If the monuments were purchased by a private group with the intent to display them on private property - would that be okay with you?