I simply hook up a high temp hose to the mash/lauter tun valve, vorlauf and drain. The grain bed does all the straining into the boil kettle.
I do run the wort thru a strainer into the fermenter but this is an effort to help aerate after the boil and the wort is cooled. And I do use a paint strainer bag in my home made hop spider to contain the hop trub so I rarely get anything in the brew kettle to fermenter strainer.