Much of this will be determined if your YN remotes are TTL compatible.
If they are, and you trigger your SB700 in TTL and let the AB800 slave optically, then AB800 will trigger too early, and you will probably get an under exposed image.
If you put a receiver on both lights, both lights will fire in sync, but you may over expose the image if the SB700 is firing in TTL.
If the receiver is put on the AB800 and the SB700 is triggered optically (SU-4 mode), then both will trigger in sync.
If there is a receiver on both, both will trigger in sync, and if you manually set power on the SB700, then exposure should be fine.
If the remote is on the SB700, but it is set to manual, then the AB800 will also trigger in sync, and no exposure issues.
The 64" PLM is right on the edge of the 10'/13' stand debate. I would say go with the 10' stand, as it can get the light lower than a 13' stand can. I would weigh the stand down with a sand bag or similar for safety. Anything larger, I would recommend a 13' stand.
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