Orthi xp and HD Mesh

Hello everyone . I'm new to the forum and am trying to get to grips with XP11. I have some HD mesh tiles already installed for the UK. I have downloaded Ortho Xp files for New Zealand but am confulsed about the directory order in my scenery ini file. At the moment the last itesm is the directory containing the HD mesh files. Should I make the new Ortho files  the last item in the ini file or insert them above the HD Mesh reference?
Thanks. I hope that's clear.