A good question.
A local answer.

Ask the hotel to confirm the exact room view and whether windows or balconies face the display.

Choose a hotel by the early-morning journey, then leave the rest of the day for nearby sights.

Have a meal nearby first or keep a backup restaurant if the stalls are crowded or limited.

Shortlist venues with a genuinely separate room and request a floor plan for the full seated group.

Ask venues for capacity, room layout, food and drink minimums and finish time in one written quote.

Check the official fireworks locations and viewing advice for the current year before choosing a lookout.

Check each attraction's current Christmas Day and Boxing Day hours before assigning it to a date.

Ask the hotel which exact room categories face the event area and whether a view is guaranteed in writing.

Dress for the forecast and stadium exposure, with a compact wet-weather layer if rain is possible.

Budget for meals and transport separately, then look at the programme to see how many performances you would realistically attend.

Compare the walking distance from legal parking with the view and crowd level, not just the straight-line distance on a map.

First check the year's official celebration schedule and the hotel's voucher conditions, including any holiday surcharge.