If they're in contact with the Devialet underside directly there's no doubt they'll get warm very quickly. Before I got mine wall-mounted even my desktop would get toasty after 30 minutes or so sitting on its silicone feet which are insulated via the silicone pads and white plastic cups. Migration & radiation is the only option for shedding heat available to the Devialet. I should mention if your isolation parts are 'points' and have receiver cups beneath them they won't transfer much heat into the cups due to reduced surface area at the contact point.
Statements in my posts are opinion only, not to be construed as fact. Any projects I engage in are at my own risk! Their outcome cannot be assured and may result in success, small/no change or catastrophic failure. I encourage no one rely on anything I say or do as gospel and to realize your mileage may vary!
