My guild is currently stepping into this new encounter. We have just had our first try. So we have been working on guild positioning and keeping tanks alive

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We run in the typical 2 groups with 10 members taking the meteor slashes (the other 5 are the melee party).
I've completely read this thread; In fact I love this forum and I've checking it since our first days in SSC/TK but this is the first time I've tried to post something

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I would like to know more guild positioning advices. We typically make 2 lines of people in each group behind the tank. Something like that (sorry for the drawing, but I think it is quite self-explanatory):
x..x..x..x..x
...................tank
....x..x..x..x
Is this correct enough? May I receive some suggestions about better positioning? Is there an optimus pathing for people who takes the burn and run to the burn-safe-spots behind the melee group?
A second question is the following one. Our resto druid is claiming some help about some grid functionality for tracking the burn duration (not only who has the burn debuff but also how long it takes to finish? Does anyone knows a confortable way of tracking it (I know that Bigwigs tracks it but she would prefer to check it directly in grid if possible)?
Thanks for your help in advance.