We set up the portacot in our lounge when DS2 (now 4 months) arrived, that way I can walk/rock DS2 when he's unsettled and I can still be around DS1 (25 months) at the same time.

As for TV, I reason that while DS2 is so little, it's just a temporary thing to amuse DS1 during those times when I can't read him books or play with him because my attention has to be focused on DS2 etc. DS1 much rather be outside anyway