We feed in a separate enclosure and always handle each snake for 5-10 minutes prior to feeding. Their tanks are cleaned and water bowls topped off or changed while they are ingesting.
No we don't sit on the couch with them. The temperature of the room with the couch is ~65 degrees Fahrenheit. It wouldn't be fair to unnecessarily subject tropical animals to that temperature.
Re how many days after a feed to wait for handling - the larger and more infrequently you feed the longer is the duration required for digestion and, of course, vice versa.