Kitchen Island Corner Posts

Hi all

Just starting to finish kitchen island - and I have these curved corner posts and decor end panels to fit

Think Im more or less there in terms of working out how they fit but on the end of the island is a fully integrated dishwasher so there is no cabinet there essentially. Just wondering how you would hold that freestanding corner post in place......screw with a little L bracket to the tile maybe?? Any thoughts appreciated

Thanks all