Do you need it to actually answer two phone lines? Because finding a low profile pcie modem with support for two lines will be very difficult. Most multiline cards are full height. There are USB modems available, do you have the option to use those instead? Then you are limited by usb ports/hubs.
Probably not, a line splitter will have to do. The modem is on the same line as a postage machine, I was just wondering if a 2-port, low-profile modem existed, which I think I'm realizing it does not.
Thanks for all the help everyone!