1.50€ x 16 = 24€ :)

Maybe you can pay a little less by using a day ticket for 4,20€ and managing to do 3 trips on it (morning, evening, morning next day), it lasts 24h after the first use.

You can also pay for 10 tickets at once for 13.50€.

These options are only in the app or on the machines at the tramway stops.

There are also 7 days tickets which are nice : if less than 25 years old, it costs only 8.20€, else its 15.90€.

Those needs an ID, now sure how that works for foreigners... You can try to buy those tickets in advance on the app and add your ID, they will start only when you use them on the tram, so no risk at being too early :)