There are plenty of ways to make piles of money with magic without so much as skirting the Laws. Tracking spells and/or ferromancy to find buried treasure/sunken ships/gold or diamond mines. Doing the same thing Harry does but for a more exclusive and better-paying clientele. Potions. Rare plants. Healing magic. Bodyguarding (as Gard demonstrates.) The list goes on.
Anyway! Let's assume our hypothetical wizard, desirous of Being Cool (to say nothing of all the modern conveniences), is less of a self-flagellating martyr than Harry Dresden. What measures does he/she take to ensure this? Big-screen TV not required, but doable.
Transport - Harry drives an ancient Beetle. A wealthier wizard could probably manage to drive a 1968 Chevy Impala (like a
certain other supernatural troubleshooter) or a 1956 Chevy Corvette. If the pre-WWII thing is really that absolute (as opposed to a mere function of the technological complexity), then why not a WWII Jeep like on the TV show*?
Apartment - get a frickin' house. Or a bungalow. Or a cabin in the woods. Or a farm. That way, you're not endangering your neighbours
and you can build a better threshold.
Modern conveniences: warding circles and lots of them. Better yet, get all your electronics close together and put them in one big warding circle. Since anything including wires crossing the circle will break its sanctity, hook them up with a bank of car batteries inside the circle. Bam. Problem solved. As a bonus, it even let the wizard use wifi. A voice interface takes care of the rest.
We know circles are normally powered by blood and will and, yes, having to cut yourself every time you want to watch TV would be inconvenient.
Even Hand however provides a solution. That story had Gard using the "sorcerous equivalent of a nine-volt battery"** to power one for Marcone.
What else else could the wizard who wants everything do to ensure a life more comfortable than Dresden's?
*
That was one of the few things the show did right IMO.
**
Yeah, so maybe it contains a Schrondinger Cat with its throat cut. Who knows how Gard does things?