Cooking pot roast on top of potatoes?

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This is the first time I ever cooked a roast before. Probably messed up a few things. I'm cooking it in a crock pot. Obviously I'm no Iron Chef here, but I can cook a lot of dishes pretty well. I'm trying to eat a little healthier though and I know roast is pretty lean so I bought one. One thing I just thought of is I put in some white wine in the bottom of the pan. Then I put 2 sliced potatoes in the bottom of it and layed the roast on top of the potatoes. Now that I have thought of it, will this make a difference that the roast is not sitting in the liquid? I put carrots and mushrooms and onion on top of that. Theres no room for me to even get a baster to draw any juicec so I'm hoping the crock pot does it well enough. Thank you for the feedback.