My experience has been if there happens to be something flakey going on and I need to call tech support they will point to any part of the installation that doesn't follow their manual or recommendations. Then my customer gets cranky and starts complaining that is wasn't installed correctly.
Better safe than sorry.
Manufacturer requirements and manufacturer recommendations are not the same thing. You do whatever makes you feel good but I don't need anybody telling me how to do my job. That's something I've noticed on this site- lots of folks would rather be told exactly what and how to do instead of providing a competent turnkey installation.
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