1. I believe the main difference between fonts.com and myfonts.com is in licensing and whether to use a subscription or one-off price. Otherwise, both are owned by Monotype.
2. For landing pages, installing Monotype fonts is pretty straightforward--just follow the instructions for including the CSS (and JS validation) at the template level.
Hi Courtney, thanks for the info.
In the end I used myfonts.com and it was really straightforward, they provided all the font files (eot, woff2, ...) and a stylesheet to use. Worked on the first try.