maybe velcro ties? strips of velcro with both types of velcro material, one on each side... works like the zipties mentioned above, but they're reusable and softer so there's even less chance of scratches.
if you want esthetics you can take it a step further and tie two or three loops of velcro tie around the central bar or whatever and than glue velcro patches to the back of the actual block, these patches will than interlock with the velcro ties (and perhaps the other half of the velcro stickes glued thereon) so there's not visible connection at the front. i've seen heavy duty velcro at my local diy depot, wich was inteded to attach tools like hammers etc to a wall so it should be strong enough.
if you make the grillblock a bit decent you can even leave it on at a carshow... might open some eyes.
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