All I can say that if you want to keep and safe funds or crypto, nano ledger is one of the good and the best for this things mate.
Only things you need to buy em in online in amazon, but if you don't want to buy em you can use Mew known as myetherwallet for crypto
or cold wallet if you want to save bitcoin.
Hardware wallets and cold storage are enough if you want a high security when storing your cryptos . you did mention mew ? Mew is only an online wallet and online wallets dont stand a chance compare to hardware wallet and cold storage when it comes to security plus mew is also risky because mew is already been hacked before and it also prone to phishing attacks .
indeed, you should not use Mew that has been hacked, of course hackers already have access to enter. I don't understand the device, now what I'm doing is providing additional security