No it will be fine.
Better to overfilter a tank then underfilter it.
Plus think of it this way, your bio-load in your tank will be a little bigger, and you will be able to handle an extra fish or two...
And if your really worried, that model has 4 filters in it, so you can always leave 2 or 3 filters in if you really do have an overfiltering problem of some sort.
I have one the Penguin 350 on my 29 (filled to 26/27) In addition to a pretty heavily planted tank, and it all works out fine for my fish...
Only thing is I only have one top layer fish (african Butterfly) guppy's are top level. So if your having many small upper level swimming fish, you may find too much surface agitation (If your mid/flow control thing is all the way open).
Just close it down some to limit flow.
I think it'll be just fine.