at an angle outside of the aisle, and last row of chairs. the feedback issue is usually completely solved with more distance. front is the last place i would ever point speakers for all the reasons listed above.
ps: a good photographer should be able to work around any speaker placement, but having it at the back or side pretty much seals the deal.
i generally shoot sound from the sides for a ceremony. photographers generally shoot from front and rear.
that i always have to go with what works best in that particular situation.
1- avoiding feedback is probably most important.
2- speakers being seen in pics is the second consideration.
3- the source for 