Need help installing bird boxes in garden shrubs

Hi there, I’m looking for a handy gardener to install a couple of bird boxes in my UK garden. The space has a mix of shrubs and a small tree, and I’d like the boxes mounted at different heights to attract a variety of species. I’m hoping for a neat, secure installation with proper drainage and a clear, predator-safe orientation. If you have experience with different box styles and heights, please let me know what you recommend. I can provide the boxes and screws, just bring your drill and ladder. Flexible on timing, but please confirm your availability and estimated start time.