We have the Smitybilt XRC bumpers on our TJ and the shackle mounts are welded both inside and out. They work well for flat towing.
You might also want to consider a supplemental tow vehicle brake setup. More and more States are requiring them for tow vehicles over a certain weight. We did not have one and one day while leaving a camp sight, the Jeep ended up climbing over the tow bar (fortunately we weren't going fast) and ruining the tow bar. It wouldn't have happened if a supplemental brake system was installed. They also greatly reduce your stopping distance in case of a panic stop. They are not cheap, but cost less than getting into an accident because you didn't have one. Needless to say, we have one now.