Cisco Wireless :: 3502e APs - How To Mount Antenna

I am still new to wireless. I have been studing for my CCNA Wireless for about 6 months now so I still have a lot of questions.

Right now I have to deploy some new APs. We are using 3502e APs. I have a qustion on how to mount antennas for these access points. I have to make a mounting bracket the new installations. What was done with the previous APs was to mount a unistrut beam to an I beam in the building. There is 2 AIR-ANT-1728's and 2 AIR-ANT-5160V-R antennas mounted straight out on the unistrut. Then they put a T bracket on the unistrut and mounted a second bar 90 degrees from the main bar and connected the third 1728 and 5160 antennas on the second mounting bracket. So we have 4 antennas in a row, and two off to the side 90 degrees from the other 4 antennas.
 
My question, is this OK to have them this way, or would it be better to have all 6 antennas in a straight line when I fabricate my new AP brackets?
 
Here is a picture of what I am talking about. This would be looking at it from above.
Current                                                       New Proposal
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          |               AP                                                       AP
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