It's hard to find a signal service that you can really exactly replicate the results of in my experience. If they trade intraday, it can be quite difficult to get the exact same prices as the provider does, and this can make a huge difference to profitability. A few % here and there could mean the difference between returning a profit and returning a loss.
Say they make an average 30 pips on a successful trade, but with a bit of a time lapse/spread/slippage etc, you are only averaging 27. That's 10%! There aren't many trading strategies that I know of that could run profitably with a 10% headwind.
If you can't find the time to trade during the day, perhaps consider learning to trade yourself, but using the longer term timeframe charts, such as the daily. That way you won't be depending on anyone else.
Just a thought though - good luck whatever you decide to do! 😀