Best direction for internal antenna on 1602i

Can anyone suggest best direction for internal antenna on 1602i when placed on a wall, as i am aware that best location for these AP's is to be placed on ceilings with antenna direction at 90 for best results.
I have done this with the majority of AP's but some need to be mounted on walls, so looking for some info on antenna direction for best results in coverage.
Thanks

Hello, tavery. 
Check table 5, 6, and 7 on this link for several antenna options for a 1600 AP. Will you be needing an Omnidirectional antenna for your application?
http://www.cisco.com/c/dam/en/us/products/collateral/wireless/aironet-antennas-accessories/at_a_glance_c45-513837.pdf
Let me know if you have additional concerns as well. Kind regards. 

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