Suspended vs. Non Suspended TT on Concrete Floor

Am considering purchasing a Clearaudio Reference or Master Reference table that would sit on a large Polycrystal amp stand. The stand will sit directly on a carpeted concrete slab basement floor. The speakers, which are about even w/ the turntable are about 9ft. apart (4.5 from the table). Would the high mass/weight/coned design of the Clearaudio tables need, or benefit significantly from, further isolation like a Vibraplane or other like device. Your advice is appreciated.