From a safety perspective, I would be aware that EQC does not use an active bonnet (hood) system for pedestrian impact. Instead it relies on the space underneath the bonnet so the bonnet can easily deform on impact. This is rated as especially good in center of bonnet in EQC, in Euroncap report, which is where frunk would usually be, compared to frunky Tesla Model 3 that is rated notably worse for pedestrians hitting bonnet center, as is Model S (Model X is good but has an active bonnet). Interesting that Model 3 and Model S frunk has been getting smaller over the years.
Additionally, trying to put frunk there might be considered a "modification" and could invalidate insurance if undeclared.
Additionally, it might not be quite as perfectly temperature regulated as in boot because there is less insulation in bonnet and in cold weather is likely colder.
Additionally, one of the most common performance issues in electric motors generally is overheating. In some motors an 18°F / 10°C degree increase in motor winding temperature can reduce its lifespan by 50%. This has an irreversible impact on the lifespan of the motor, regardless of whether the overheating was temporary or long-lasting. More space/ventilation likely help regulate the temperature.
Regarding convenience, the boot can easily be opened with a favorite way (door or car key or leg movement or logo latch) compared with multiple steps of levers and hidden latches then touching dirty bonnet for frunk, unless even more equipment is added for motorised boot release.
While I would not say it is impossible, they are just some of the issues that come to mind immediately, so for a faster way I would search for "car trunk tidy" on Amazon instead. Plenty of out-of-the-way-but-accessible styles to choose from - hanging, velcro'd, smellproof, false-floor-type etc.
