I have not tried using sheets of plastic but I would if I had too much rain.
This year we had day after day of rain after I planted my tomato seedlings and I was worried about them getting too much water so I bought some cheap plastic baskets at the Dollar store and covered my tomatoes during a couple of the storms. This only works for small plants because they outgrew the baskets fairly quickly but they all came through it and are fine now.
20190514_155814 by
Brownrexx, on Flickr