We cannot suggest any specific alts but I think it would be better to invest to top ten alts that can be found in coinmarketcap. Those are alts that are much stable and has a good circulating supply.
That's right, and the altcoin listed in that post is also a good altcoin and also has a good rating in the coin marketcap, so it doesn't hurt to try to invest in some of the altcoins mentioned above, because altcoin also has a good circulation in the market.