Experiment with various angles and placements, monitoring the power stored on a daily basis and making changes as necessary. Any angle might be acceptable, but there are times when a small tweak in the position can have a noticeable impact. Try different options and stick with the spot that works best.
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A charge controller is a great addition to any solar array, specifically those that are working above 10 watts on a regular basis. These small devices act as "ON" and "OFF" switches to protect your batteries. They prevent overcharging from damaging your batteries and can provide more advanced charging options depending on the make and model.
Are you building a home or moving to a remote location? If so, then you might want to seriously consider using solar energy to power your place. Getting the local energy company to come out to you might be expensive or impossible, so using renewable solar energy is a great way to ensure you will have all the energy you need.