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Usual (readily available) automotive grade urethane adhesives have tensile strength of over 1000PSI and lap shear strength of over 500PSI. The engine mount have a diameter of, say, about 3", so the surface area is at least ~7 sq-in, which requires a tensile force of 7000lbs or 3500lbs to separate the adhesive. That gives a conservative safety factor of 5-10 in this application, I would say that is relatively safe. The stock motor mount rubber is bonded by adhesive to the metal bracket, so using adhesives is a common practice here. And as I mentioned in the other post, it is unlikely for the mounts to actually experience an actual "pull" force - just like the suspension springs, during hard cornering one spring compresses and the other spring unloads, but doesn't actually "stretch" or "pull". Solid motor mounts *could* fatigue the cross member where the mount bolts through, this is just sheet metal without significant structure, so it is conceivable for the solid mounts to fracture the bolt hole/slot through repeated torqueing. I am not saying it would happen, just pointing out that there are potential drawbacks beyond just noise/vibration...
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