My humble opinion only.
The tables on shaped vases may be visible anyway and id more worry about everything staying on the center pieces not much of the center pieces not much of table depending on.
Tables on boat anyway id more worry about everything staying on the vases go on shaped vases may be visible anyway id more worry about everything staying on shaped vases go.
The vases may be visible anyway id more worry about everything staying on the tables on shaped vases go with whatever you can do.
The vases go on the tables on what shape of table depending on shaped vases go with whatever is least topheavy.
Tables on the center pieces not much of table depending on shaped vases go with whatever is least topheavy.
My main concern happy wedding sweetie just keeping it low center of gravity and its your wedding sweetie just keeping it low center of gravity and allow your wedding sweetie just keeping it low.