You need the right spiders. I have at least 6 Pholcus phalangioides in my flat. They dutifully stay put just at the edge between the ceiling and wall.

My home is well protected. Every bug crawling around on ground to mid-level is vanquished by may cats. If they go high, the cellar spiders are waiting.

But sometimes I have to be lucky to safe a spider from my cats, when it wanders too far down.