This is general advice based on fitting 5 tows bars to Fiats (Punto HGT, Tempra, Tipo (old), Croma 2005 and 500X.
If you plan on towing a caravan or any other unit which additional power is required (e.g fridge, lighting, charging a battery etc. then you need TWO power feeds from the car.
Both feeds should be fused, one at 15A (this is for the bypass relay and trailer lighting) and one at 25A for the auxilary electrics / power. I suggest you wired for a modern standerd single 13 pin socket and not two separate 7 pin sockets.
Both feeds should be made with 2.5 mm squared cross sectional area good quality cable. These feeds are ideally taken directly from the battery, fused in the engine comparment and then run underneath the car to the rear. Where possible use the plastic trunking underneat the car where the brake pipis and fuel lines run. Route to rear corner of the car and then up into the boot/inner wing area. Earth connections should come from the chaais eart posts in the rear of the car.
If fitting auxiliary 25A feed then you ideally need a COMBI relay to control this feed. This combi relay will switch power on only when the engine is running. This is to stop draining the car battery when the engine is not running. This relay can be fitted in the rear wing area but I prefer fitting it in the engine compartment. (See
http://www.rydertowing.co.uk/)
If doing the aux electrics then this is an ideal time to put additional power sockets in the boot of the Tipo. I added a 4 way 12V socket block (on flying lead) as the 500X had no rear end power facilities.
If your towbar is designed for your Tipo then the mechanical fitting will be straight forward on no drilling required.
You challenging items will be how to get the rear bumper off and making any required cut
outs.
Search the 500X forum as I put a post there back in 2015 about doing a 500X tow bar installation. With the 500X there was a leap of faith in detaching the bumper wings from the car wings as hidden clasps are used and one has to be brave and just pull the bumper wings away. The Tipo could be different.
Just go slow and steady. Plan the electrics and even do most of it up to final socket wiring. The bumper removal and tow bar installation could take longer than you expect so allow a couple of days if you are reliant on the car.
Lastly when dropping and replacing the rear bumper ensure that all connections to number plate and parking sensors are detached and replaced. Also TEST each of the reversing sensors before the final bumper commit stage. THIS IS MOST IMPORTANT.