Weld in Light Bar for Better Protection?

Have two kids that would ride in the back of a convertible at times. Would like to add some protection, but not make the rear seats un-useable (full cage). So I called CDC the other day that makes a light bar.

After discussing what I wanted to do, I asked the guy whether, after installation with the standard fasteners, could the thing also be tack-welded to the frame. He thought so, but had never heard of someone doing so.

So firstly, have any of you seen or done this?

Also, are any of you aware of rollover accidents that involved light bars and could comment how they held up?

Thanks

Thanks for the reply...

About the roll cage in your signature, does it impede access to the back seat or restrict front seat adjustibility in any way?