I would definitely go with a liquid receiver in this setup. Due to the rise in the liquid line, the reduction in head pressure on the way up from the bottom will encourage the refrigerant to flash off in the line. Without some sort of receiver at the top, this "burping" will go straight into the cap tube and mess up the cycle. In any case, I would try to make this liquid return line as small a diameter as feasible for good oil return. Line too large = no oil return, line too small = pressure drop and flash gas.
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