You're in luck, the standard MFT file watcher job allows you to monitor for 5 files -

1. Create a File Transfer job in Planning (drag down from the Templates Manager, top left).

2. Use the file watcher or file watcher with copy option (has a eyeball as part of the icon).

3. Press the + button to add more watchers (5 max).

4. Use * for wildcards or single ? to substitute for a single character.