Yes, with dabs of RTV between the rubber end seals and the pan,at the corners; and a teensy bit more on top of the rubber where it contacts the side-pieces.Put the RTV on there such that most of the SQUEEZE-OUT goes to the outside,where you can wipe it off; but not so biased that there is no squeeze-out towards the inside at all.If that makes sense to you. Squeeze-out is inevitable, so let it dry before the oil goes in.
If the engine is installed,I usually glue the side pieces to the block with a contact cement. Then I know they will stay where I put'em.Whenever possible I use line-up pins to aid in positioning the pan. Then I can hold the darned thing up there with one hand while I start a couple of screws wherever it seems easiest,with the other.If you are doing this on the floor, a correctly sized stick, or a small jack, can be wedged under there to make screw starting really easy.The line-up pins can be nothing more than long bolts with the heads cut off and a screwdriver slot cut across the shank end. I use those types of pins everywhere I can.