According to ANCUR B&W UFAQ:
If Loki gains a subroutine with a self-reference from another piece of ice, such as a trap like Kitsune, what happens?
Everything in the subroutine resolves as normal, except for any effect with a self-reference in it. The reference does not refer to Loki, so it cannot resolve.
Based on the example of Kitsune, I'd expect the effect fizzles because you must place the ice directly behind Howler which is a broken self reference. Then, since you couldn't install the ice, it cannot be derezed, and you don't trash Howler because of the broken reference.
My reading of the first sentance is that the install location is a requirement on the effect resolving. This is different from a Wormhole/Bloom interaction since instead of resolving subs on another card you're copying subs from another card.