Many Mission models to include the M70, M71, M72 have this design and sound fine. No hard and fast rules with tweeter placement.
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Sorry, it is not the woofer that is on top, but the tweeter that is on the bottom!
My wife has a pair of tse smaller Missions with that configuration and I can't see that it changes anything, assuming the speakers are on stands and at the correct height.
BTW, what ever happened to Mission are they still in business?