YOU CAN TAKE OUT THE BOARD AND DRILL HOLES IN THE CONCRETE WITH A CONCRETE BIT AND PUT IN A LAG STUDS OR BOLTS AND BOLT IT RIGHT TO THE FLOOR. OR USE A THINNER BOARD OR MAKE A SMALL STEP AROUND THE TOILET TO STEP UP ON. I HAVE SEEN ALL THOSE SUGGESTIONS IN THE PAST. THEY HAVE ALL KINDS OF DIFFERENT BOWL RINGS THESE DAYS AT MOST HARDWARE STORES TO ACOMIDATE ALL INSTALLATIONS.CHECK IT OUT