For passive I follow cornhub advice For flipping, well I say don't put eggs in one basket. So put in 3 stocks imho. That way let's say one stock is crashing hard after yiu bought, but the other one is going up, you can sell the profitable one n double down the crashing one in the future.
The stock increments will become more expensive for every 'level' you buy one, but that changes too since the prices of the stock and payout fluctuate too. Maybe in a while, when the stock price is cheap and the payout is worth more, it will be more profitable than it is right now.
Best to check out for yourself for how much one increment of a stockblock goes, what it offers, how much you can sell it for and go from there.