WHMCS Wordpress Integration

Hi, I have just purchased a reseller account and will be looking to install WHMCS and integrate with Wordpress (I haven't installed either yet).

My question is what location is best for installation of WHMCS and Wordpress? For example, should I install Wordpress in root and WHMCS in a subdirectory or vice-versa.

I would rather get things set up properly from the outset.

Many thanks,

Tim