stacking speakers?

Ok...so I know this is probably not the best option...but for now I have to use something to put the BLS speakers on for the time being. Is this ok? I have two solid floor standing speakers that have a base of about 12" X 12" and are about 3feet tall. Is this ok until I can get actual stands? Any reason why this would mess up either set of speakers (being that there are magnet in both sets)?

Oh...and just to clarify... i don't plan to run both sets at the same time...the floor speakers would be just "stands" for now and not be operational.

Any advice would help...Thanks in advance...

They should be fine as temporary stands.

Thanks Gonk...you're the man!